Abstract
In the present paper we propose a microscopic model to study the multiferroic properties of Bi\(_2\)Fe\(_4\)O\(_9\) nanoparticles. The spontaneous magnetization \(M_s\) increases with decreasing nanoparticle size. \(M_s\) is shape dependent. It is larger for cylindrical than for spherical nanoparticles. \(M_s\) increases with increasing Co and Ho concentration, whereas by Mn doping it decreases. These tunable magnetic properties can be widely applied in spintronics. The polarization \(P_s\) increases also with decreasing nanoparticle size. Mn ion doping leads to increase of \(P_s\), the phase transition temperature \(T_C\) and the dielectric constant and so to enhanced electric and dielectric properties of Bi\(_2\)Fe\(_4\)O\(_9\) nanoparticles. Applying an external magnetic field \(P_s\) is enhanced, which is indirect evidence for a strong magnetoelectric coupling. The specific heat \(C_p\) shows an anomaly at the Neel temperature \(T_N\) which vanishes by applying an external magnetic field. The band gap energy \(E_g\) decreases with increasing Ti, Co and Ho dopants whereas by Mn doping \(E_g\) increases.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Derived data supporting the findings of this study are available from the corresponding author upon reasonable request.]
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One of us A.T.A. acknowledges financial support from the Center for Research and Design of the Sofia University of Architecture, Civil Engineering and Geodesy (contract number BN-271/23).
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Apostolova, I.N., Apostolov, A.T. & Wesselinowa, J.M. Size and doping effects on the magnetic and electric properties of Bi\(_2\)Fe\(_4\)O\(_9\) nanoparticles. Eur. Phys. J. B 96, 77 (2023). https://doi.org/10.1140/epjb/s10051-023-00550-x
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DOI: https://doi.org/10.1140/epjb/s10051-023-00550-x